Abstract
Abstract A small plot efficacy study was conducted at the Texas A & M Research and Extension Center in Weslaco, Texas, to evaluate selected insecticides and the effect of spray volume on control of onion thrips on onions. Experimental plots measured 3 beds (40 inch beds) by 25 feet, with two rows of onions per bed. Treatments were arranged in a randomized complete block design with four replications. Treatments were applied on March 4, 11 and 18, with a CO2 pressurized sprayer (40 psi) with 3 10X hollow cone nozzles per bed (1 over-top, 2 on drops). Spray volume was adjusted by boom speed. Thrips were sampled by whole plant inspection of five randomly selected plants per plot. All thrips (adults and nymphs) were counted.
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